FileChecksum doesn't support hash types as per spec

[qrdl]

Contrary to SPDX 2.2 spec 4.4.4 (Other algorithms that can be provided optionally include SHA224, SHA256, SHA384, SHA512, MD2, MD4, MD5, MD6) only SHA1, SHA256 and MD5 are actually supported by the parser: https://github.com/spdx/tools-golang/blob/main/tvloader/parser2v2/parse_file.go#L74 , all other algorithms cause parsing error

[qrdl]

Dupe of #96

[lumjjb]

Hi @qrdl ! Thanks for raising the issue. Can you comment on #96 and we will use that issue to track. Can you mention what hashes are a priority for you?

Closing since duplicate.